mine did sort of the same thing actually. After i took the video he switched back to his old shell, then went back and took a peak at another shell. Eventually he chose the one you see in the video above

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Reef aquariums made easy with 3reef aquarium forums - one of the oldest and friendliest aquarium forums online. 3reef came online in 1996 as 'Three Steps To A Reef Aquarium.' This title was created as an attempt to overcome the common fears associated with keeping a reef aquarium, especially at that time. 3reef still retains its roots and remains a friendly forum for new people interested in aquariums and veteran hobbyist alike.